Last updated on January 21st, 2020
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If you are growing a citrus tree, the best way to keep it healthy and happy in a slightly colder environment is to grow them in a container. If you are growing a citrus tree in a container, it also makes it easier for you to provide the right protection when winter comes as they can easily be moved indoors or into a greenhouse over winter.
Why weather matters
Citrus trees are not native to Britain. The weather is too cold for many if not all large citrus trees, but smaller hybrids like Clementines and Meyer lemons, even kumquats can be more tolerant of slightly cooler temperatures most of the year but even these need bring indoors in winter.
Still, they need adequate sunlight and warm temperatures when winter comes. Growing them in containers makes it easier to move them indoors and provide the right level of protection in bad weather.
Different types of citrus trees
The type of citrus tree you have will directly influence how tolerant it is a cold temperature but in general, it’s much safer to bring them indoors before the nights start to get cooler.
Tender citrus trees
Sweet oranges, Tahiti limes, mandarins, kumquats, and grapefruits need to stay above 5 degrees Celsius minimum, ideally even warmer. They should be moved inside before temperatures drop at night below 5 degrees Celsius and you shouldn’t put them back outside until the end of Spring once the day and night temperatures are warmer again and the risk of frost has passed.
Hardier citrus trees
Lemons and kaffir limes can tolerate temperatures down to zero degrees and for short amounts of time temperatures that are negative one degree or negative two degrees Celsius. If you have a mild winter, you can keep your trees outside, but you should still make sure they aren’t sitting in water and are protected from a lot of rain and snow.
Too much rain can lead to root rot and the same as said of snow if you leave compact snow on top of the soil in the container. So always keep your eye out for this and make sure that the root ball doesn’t freeze and the roots aren’t sitting in water. Even though they are hardy to an extent, we still recommend bring them indoors so they don’t get caught out in a sudden temperature drop or worst, freezing temperatures.
How to care for citrus trees over winter
Ideally, you want to move your plants indoors in the winter. Growing them in pots might make it easier to move the pot inside when the weather turns which is why re always recommend growing citrus in containers. This simply affords your citrus tree warmer temperatures, whether it is inside your home or a greenhouse. When you bring them inside, they still need access to sunlight, so it’s best to put them near a window where they get as many hours of direct sunlight as possible. Sunlight is very important and if they don’t get enough sunlight the leaves can start to droop.
If you are leaving your citrus trees outdoors when the weather turns at the end of summer all the way through the beginning of Spring. Even if only for a few months out of this time period, you want to position them such that they get sunlight all the time and have temperatures around 5 degrees Celsius. Still, it’s safer to get the indoors sooner rather than later.
Where not to position your citrus tree
If your plant is inside make sure you keep it away from a radiator or underfloor heating and pick a place that’s free from any temperature fluctuations so away from outside doors that will cause a short period cold drafts from outside. What they need it a consistent temperature, ideally around 10 degrees Celsius minimum and a little warmer for oranges and plenty of light.
What if you cannot bring them indoors
If you cannot bring them inside, you can wrap them with horticultural fleece and wrap the pot in lagging or bubble wrap and bring them up against the wall of your home for additional protection. Again you want to make sure they are protected from the majority of the downpour, heavy winds, and too much snow. If it’s going to be very cold at night, it might be better to move your tree somewhere slightly more permanent at least for the winter rather than going out every day and moving it at night and then bringing it back out in the morning.
Feeding citrus trees in winter
Even in the winter, it is best to use a winter Citrus feed to keep your plants healthy and happy. You should use a winter feed every other watering to give it the right amount of phosphorus and potassium overwinter.
- Carefully balanced to maintain growth
- Helps prevent premature leaf fall and discolouration
- Apply weekly from October to March
- High nitrogen content is ideal for citrus plants
- Discourages premature ripening, fruit drop and leaf discolouration
- Apply weekly from April to September
Watering citrus trees in winter
During the wintertime, whether the plant is indoors or protected outside, you should still give it regular watering as necessary. Check on the soil itself, and see if it’s dry to the touch before you add more water. The most significant risk citrus trees face in winter is damaged from root rot because they sit in too much water. In fact, if you bring it indoors, you may only need to spray it with a mister periodically. To give you an idea you will probably go from watering daily to watering a couple of times a month in winter. Overwatering in winter is one of the most common causes of leave drop.
Leaves drooping and dropping
During the wintertime, you need to be on the lookout for leaf drop. If the indoor temperatures change dramatically, it can cause the leaves to fall. When the skies get darker and the days get shorter, the limited light makes it difficult on certain citrus trees which can cause the leaves to droop and even drop. If this is the cause, once the days get longer and more sunlight appears, the leaves will be replaced. So if you notice just a handful of leaves dropping especially during January and February, don’t worry. But if you notice a lot of leaves dropping, you might consider changing the position so that the temperatures remain steady and consider if you have overwatered.
If you notice any signs of pests, if you see holes in the leaves or stickiness, even white mould, treat it as soon as possible. Bringing your plant indoors over winter provides warm conditions that can become a breeding ground for things like aphids, mealybugs, and red spider mites.
- Kills most common insect pests on a comprehensive range of fruit and vegetable plants such as apples and pears.
- Contact insecticide that can protect from pests for up to 2 weeks.
- Ideal for Grow your own.
- Kills and controls greenfly, blackfly, caterpillars, beetles, weevils, apple & pear suckers, capsids, sawfly, whitefly.
Overall, making sure the plant is warm, dry, and properly feed will go a long way toward keeping your harvest bountiful and giving you a reliable citrus tree that produces fruit year after year.
Image credits – Shutterstock.com
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